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要旨●当院で2008年4月〜2018年4月の10年間に内視鏡的あるいは外科的に切除された非乳頭部十二指腸SM癌12症例(12病変)を対象として,その臨床病理組織学的所見を検討した.患者の性別,年齢に特徴的傾向はなかった.腫瘍の局在部位は,乳頭口側が10病変,乳頭肛門側は2病変のみであり,乳頭口側の病変が多かった.腫瘍径中央値(範囲)は14(7〜70)mmであったが,4病変は10mm以下であり,腫瘍径が小さくともSM深部浸潤を示す病変がみられた.色調は,発赤調が8病変,同色調・白色調が4病変であった.肉眼型は,隆起型(0-Is型・0-IIa型)が6病変,複合型(0-IIa+IIc型,0-IIa+Is型)が6病変であり,陥凹型は認めなかった.主組織型は,papが2病変,tub1/tub2が7病変,por/sigが3病変であった.SM浸潤距離中央値(範囲)は1,100(400〜3,000)μmであり,脈管侵襲は,半数の6病変に認めた.リンパ節転移は,リンパ節郭清が行われた11病変のうち5病変に認め,リンパ節転移率は46%であった.腫瘍の形質発現は,胃型が4病変,胃腸混合型が7病変,腸型が1病変であり,胃型マーカー(MUC5AC,MUC6)の発現は92%(11/12病変)でみられた.以上の特徴を指摘したが,少数例での検討であるため,今後のさらなる症例の集積が必要である.
Between April 2008 and April 2018, 12 patients with primary SM-NADAC(submucosal invasive non-ampullary duodenal adenocarcinoma)underwent treatment at our institution. This retrospective study aims to investigate the clinicopathological characteristics of SM-NADAC in 12 patients [median age:67(range:49-83)years ; 6 males and 6 females]. The median tumor size was 14(range:7-70)mm, but 4 patients had a small tumor(≦10mm). The lesions were located in the first, second, and third parts in 3, 8, and 1 patients, respectively. In addition, 10 of 12 tumors were located on the oral side of the papilla. Based on the macroscopic type assessment, 6 patients were evaluated(0-Is, 0-IIa), while 6 patients exhibited the mixed form(0-IIa+IIc, 0-IIa+Is). The histology of patients was as follows:pap(2 patients) ; tub1/tub2(7 patients) ; and por/sig(3 patients). The median SM invasion depth was 1,100(range:400-3,000)μm. Moreover, 6 of 12 patients involved a positive lymphovascular invasion. Overall, 46%(5/11)were lymph node metastasis-positive cases with lymphadenectomy. The immunophenotypes of tumors were as follows:gastric type(4 patients) ; mixed type(7 patients) ; and intestinal type(1 patient). Therefore, 92%(11/12)of SM-NADAC cases displayed gastric marker(MUC5AC, MUC6)expression. Notably, owing to the rarity of the disease, our sample size was small, which necessitates further evaluation of large-scale cases in the future.
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